ARM/ARM64: KVM: Emulate PSCI v0.2 MIGRATE_INFO_TYPE and related functions

This patch adds emulation of PSCI v0.2 MIGRATE, MIGRATE_INFO_TYPE, and
MIGRATE_INFO_UP_CPU function calls for KVM ARM/ARM64.

KVM ARM/ARM64 being a hypervisor (and not a Trusted OS), we cannot provide
this functions hence we emulate these functions in following way:
1. MIGRATE - Returns "Not Supported"
2. MIGRATE_INFO_TYPE - Return 2 i.e. Trusted OS is not present
3. MIGRATE_INFO_UP_CPU - Returns "Not Supported"

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 3b6a0cf..cce901a 100644 (file)
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -182,6 +182,22 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
        case PSCI_0_2_FN64_AFFINITY_INFO:
                val = kvm_psci_vcpu_affinity_info(vcpu);
                break;
+       case PSCI_0_2_FN_MIGRATE:
+       case PSCI_0_2_FN64_MIGRATE:
+               val = PSCI_RET_NOT_SUPPORTED;
+               break;
+       case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+               /*
+                * Trusted OS is MP hence does not require migration
+                * or
+                * Trusted OS is not present
+                */
+               val = PSCI_0_2_TOS_MP;
+               break;
+       case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
+       case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
+               val = PSCI_RET_NOT_SUPPORTED;
+               break;
        case PSCI_0_2_FN_SYSTEM_OFF:
                kvm_psci_system_off(vcpu);
                /*
@@ -207,12 +223,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
                ret = 0;
                break;
        case PSCI_0_2_FN_CPU_SUSPEND:
-       case PSCI_0_2_FN_MIGRATE:
-       case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
-       case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
        case PSCI_0_2_FN64_CPU_SUSPEND:
-       case PSCI_0_2_FN64_MIGRATE:
-       case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
                val = PSCI_RET_NOT_SUPPORTED;
                break;
        default: